#include <WiFi.h>
#include <ThingSpeak.h>


const char* ssid = "Wokwi-GUEST";
const char* password = "";


unsigned long channelID = 2271287; 
const char * writeAPIKey = "ADUXW3IO90CMHCAU";
const char * readAPIKey = "MFLQK8T18H4XW4GS";
unsigned long talkBackID = 50030; // 
const char * talkBackAPIKey = "J7GT42198SP8T3Y0";


int pirPin = 2; 
int ledPin = 4;


WiFiClient client; 
int pirState = LOW; 
int alertState = LOW;

void setup() {
  Serial.begin(115200); 
  pinMode(pirPin, INPUT); 
  pinMode(ledPin, OUTPUT); 
  digitalWrite(ledPin, LOW); 

  
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

  
  ThingSpeak.begin(client);
}

void loop() {
 
  int pirValue = digitalRead(pirPin);

 
  if (pirValue == HIGH) {
  
    if (pirState == LOW) {
      
      Serial.println("Motion detected!");
      pirState = HIGH; 
      ThingSpeak.writeField(channelID, 1, 1, writeAPIKey);
    }
  } else {
    
    if (pirState == HIGH) {
      
      Serial.println("Motion ended!");
      pirState = LOW; 
      ThingSpeak.writeField(channelID, 1, 0, writeAPIKey);
    }
  }

  
  String command = ThingSpeak.readStringField(channelID, 2, talkBackID, talkBackAPIKey);
  
  
  if (command == "alert on") {
   
    if (alertState == LOW) {
     
      Serial.println("Alert on!");
      alertState = HIGH; 
    }
  } else if (command == "alert off") {
    
    if (alertState == HIGH) {
      
      Serial.println("Alert off!");
      alertState = LOW; 
    }
  }

  
  if (alertState == HIGH && pirState == HIGH) {
    
    digitalWrite(ledPin, HIGH);
  } else {
   
    digitalWrite(ledPin, LOW);
  }

  delay(100);
}